The deteriorated form of Bayren Munich is an advantage for Leverkusen. With 15 more games left for both of the team, it's still early to call out a winner and the ultimate decision could be met when these team meet again, It was a draw the last time they met at Allianz Arena and now they are meeting again on February 10, this time at BayArena.
The game between Bayern Leverkusen, the league leaders and FC Bayern Munich, a major league contender, will be a tough match to watch, This is a game that I wouldn't want to miss watching, and it will be a decisive game in that side of league, that is between who will likely lift the trophy at the end of the season because whoever that wins in that game will actually top the league, I don't think if Bayern find it easy in that despite being the superior team here.
This is certainly not going to be the end of the season no matter who wins the game. As you can see Bayer Leverkusen can tie a game 0-0 despite being the overwhelming force for the whole game. Yet it ended with only one point for them and although I understand that it looks as if Bayer Leverkusen would be able to win all of their remaining games afterwards, it's 90% certain that it is not going to happen. They are still facing several top teams and mental pressure would go up significantly once they understand that it is all up to them.
Same thing for Bayern as their last three games were 0-1 against Bremen, 1-0 against Union Berlin and 2-3 against Augsburg. It could have ended even worse than that for them. In other leagues games like these could be the decision. In the Eredivisie for example. But not in the Bundesliga.